This is definitely not a normal gallbladder. The wall is normal in thickness, and there is no pericholecystic fluid. However, there is a stone impacted in the GB neck (see the above photo, just to the right of the word stone)
Imaging the neck of the GB is a crucial element of a thorough GB US. Always make sure you visualize the neck and look for hyperechoic stones with posterior shadowing. Sometimes these can be tricky, and will only manifest as shadowing posterior to the neck of the GB.
A stone that is impacted in the neck of the gallbladder is unlikely to get a whole lot better, so consider consulting surgery early on for these patients, especially if they are symptomatic, even if their labs and US are otherwise normal. Remember, mobile stones can be differentiated from non-mobile impacted stones by reevaluating the neck of the GB after having the patient roll into the left lateral decubitus position.